Questions

A solid conducting sphere of radius 10 cm is enclosed by a thin metallic shell of radius 20 cm. A charge q = 20 mC is given to the inner sphere. Find the heat generated in the process when the inner sphere is connected to the shell by a conducting wire.

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12 J

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detailed solution

Correct option is C

On connecting, the entire amount of charge will shift to the outer sphere. Heat generated isUi−Uf=q28πε0R1−q28πε0R2⇒=(20×10−6)×9×109210.10−10.20=9J

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